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Title
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Distinct characteristics of seasonal (Bet v 1) vs. perennial (Der p 1/Der p 2) allergen-specific T cell responses
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Author
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Abstract
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| Background A better understanding of allergen-specific CD41 T cell responses is needed to help improve immunological therapies. Objective To compare CD41 T cell responses against seasonal (Bet v 1) and perennial (Der p 1, Der p 2) allergens. Methods Major histocompatibility complex class II peptide tetramers were engineered to monitor allergen-specific T cell responses. After in vitro expansion, tetramer1 cells were tested for surface markers using cytofluorometry. Cytokine gene expression and production were assessed using quantitative PCR and cytokine surface capture assays, respectively. Results Tetramer1 cells were detected in 19 patients allergic to house dust mites (HDM), seven allergic to birch pollen, 13 allergic to both and nine non-allergics with either an HLADRB1 0101, 0301, 1501 or an HLA-DPB10401 background. High-avidity T cells are elicited against the immunodominant Bet v 1141155 epitope, whereas broader low-avidity T cell responses are induced against Der p 11630,110124,171185 and Der p 22640,107121 epitopes. Responses against Bet v 1 involve effector (CDL62 low, CCR7 low) or central (CD62L1, CCR71) memory cells in allergic and non-allergic individuals, respectively, whereas central memory cells are mostly detected against mite allergens. In non-allergics, both mite and Bet v 1-specific T cells produce IFN-g and IL-10. In contrast to Bet v 1-driven Th2 responses, mite allergens induce highly polymorphic responses in allergics, including Th1, Th2/Th17 or mixed Th1/Th2 profiles. Mite-specific T cell frequencies in the blood remain in the range of 16104 CD41 T cells throughout the year. Conclusion Different memory CD4 Q2 1 T cell responses are elicited in the context of chronic vs. seasonal stimulation with the allergen(s). The heterogeneity in the patterns of CD41 T cell responses observed in patients allergic to HDMs should be taken into account for specific immunotherapy. |
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Language
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English
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Source (journal)
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Clinical and experimental allergy. - Oxford
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Publication
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Oxford
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2011
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ISSN
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0954-7894
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DOI
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10.1111/J.1365-2222.2010.03641.X
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Volume/pages
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41
:2
(2011)
, p. 192-203
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ISI
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000286213600008
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Full text (Publisher's DOI)
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